Automatic sensor positioning for biometric sensing

1. A head-mounted display device, comprising: a display unit; a sensor configured to receive a biometric signal, the biometric signal comprising one or more sets of biometric signal data, each set of biometric signal data corresponding to a different position of the sensor; a housing configured to enable the sensor to retract into the housing along a first axis of motion; a motion track disposed on the housing, wherein the motion track is configured to guide movement of the sensor along a second axis of motion and a third axis of motion; a motor configured to move the sensor along the first axis of motion, the second axis of motion, and the third axis of motion as provided by the housing and the motion track; and a processor communicatively coupled to the sensor and the motor and configured to: compute a noise component for each of the one or more sets of biometric signal data; compute a set of signal-to-noise ratios (SNRs) for each of the one or more sets of raw biometric signal data; and determine, based on computing the set of SNRs, a position for the sensor, the position corresponding to a greater or maximum SNR from the set of SNRs.

2. The head-mounted display device of claim 1 , comprising a headset housing, wherein the housing is coupled to the headset housing.

3. The head-mounted display device of claim 1 , wherein the biometric signal comprises a pulse from a temporal artery.

4. The head-mounted display device of claim 1 , wherein the processor is configured to instruct the motor to move the sensor to one or more positions, each position of the one or more positions corresponding to a set of biometric signal data of the one or more sets of biometric signal data.

5. A method for positioning a sensor configured to receive biometric signals, comprising: receiving a biometric signal using a biometric sensor at a first position, the biometric signal comprising a set of raw biometric signal data; computing a noise component of the biometric signal; performing signal analysis on the biometric signal; determining, based on the signal analysis, that no criteria are met; in response to determining that no signal criteria are met: retracting, via a motor, the biometric sensor to a retracted position, wherein the biometric sensor is disposed in a housing; moving, via the motor, the biometric sensor from the first position to a second position in a first direction along a motion track configured to guide movement of the biometric sensor, wherein the biometric sensor is in the retracted position during movement; receiving a second biometric signal using the biometric sensor at the second position; performing a second signal analysis on the second biometric signal; determining, based on the second signal analysis, that at least one signal criteria is met; and in response to determining that the at least one signal criteria is met, moving, via the motor, the biometric sensor to a third position, wherein the biometric sensor is moved in a second direction.

6. The method of claim 5 , wherein performing the signal analysis comprises computing a signal to noise ratio (SNR) of the biometric signal.

7. The method of claim 6 , wherein the at least one signal criteria includes a lesser or minimum threshold SNR.

8. The method of claim 5 , comprising: detecting a set of biometric signals using the biometric sensor at a series of positions, each of the set of biometric signals comprising a set of raw biometric signal data; computing a set of noise components for the set of biometric signals; computing a set of SNR ratios for the set of biometric signals; determining, based on the set of SNR ratios, a third position corresponding to a greater or maximum SNR ratio for the set of biometric signals; and moving the biometric sensor to the third position.

9. The method of claim 5 , comprising: determining a threshold time period has elapsed since the signal analysis; and detecting a third biometric signal using the biometric sensor at the first position.

10. The method of claim 9 , comprising: performing a third signal analysis on the third biometric signal; determining, based on the third signal analysis, whether the at least one signal criteria is met; and fixing, based on the determination that the at least one signal criteria is met, the biometric sensor in the first position.

11. The method of claim 5 , wherein the biometric signal comprises a pulse from a temporal artery.

12. The method of claim 5 , comprising: receiving a third biometric signal at the third position; performing a third signal analysis on the third biometric signal; determining, based on the third signal analysis, that the at least one signal criteria is met; and in response to determining that the at least one signal criteria is met, fixing the sensor at the third position.

13. A system for biometric sensing, comprising: a sensor configured to receive a biometric signal at a first position, the biometric signal comprising a set of raw biometric signal data; a housing, wherein the sensor is configured to retract into the housing; a motion track disposed on the housing, wherein the motion track is configured to guide movement of the sensor; a motor configured to extend and retract the sensor out of and into the housing and move the sensor along the motion track; and a processor communicatively coupled to the sensor and the motor and configured to: compute a noise component of the biometric signal; perform signal analysis on the biometric signal; and determine, based on the signal analysis, whether at least one signal criteria are met.

14. The system of claim 13 , wherein the processor is configured to move, in response to determining that no signal criteria are met, the sensor from a first position to a second position.

15. The system of claim 13 , wherein the processor is configured to compute a signal to noise ratio (SNR) of the biometric signal.

16. The system of claim 15 , wherein the at least one signal criteria includes a lesser or minimum threshold SNR.

17. The system of claim 13 , wherein the sensor is configured to detect a set of biometric signals at a series of positions, each of the set of biometric signals comprising a set of raw biometric signal data; and wherein the processor is configured to: compute a set of noise components for the set of biometric signals; compute a set of SNR ratios for the set of biometric signals; and determine, based on the set of SNR ratios, a third position corresponding to a greater or maximum SNR for the set of biometric signals.

18. The system of claim 13 , wherein the processor is configured to: determine a threshold time period has elapsed since the signal analysis; and detect a second biometric signal using the biometric sensor at the first position.

19. The system of claim 18 , wherein the processor is configured to: perform a second signal analysis on the biometric signal; and determine, based on the second signal analysis, whether the at least one signal criteria is met.

20. The system of claim 13 , wherein the processor is configured to instruct the motor to move the sensor in at least three degrees of freedom by extending the sensor out of the housing, retracting the sensor into the housing, moving the sensor along the motion track, or any combination thereof.